Method and arrangement for measuring a magnetic field using the Faraday effect, with compensation for intensity changes

US6034523A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Thomas Bosselmann · Erlangen, DE
• Peter Menke · Erlangen, DE

Key dates

• Filing date: Aug 22, 1997
• Grant date: Mar 7, 2000
• Expiry date: Aug 22, 2017

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/0322
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Two light signals pass, in opposite directions, through a series circuit comprising a first optical fiber, a first polarizer, a Faraday sensor device, a second polarizer and a second optical fiber. To set the working point, additionally, the planes of polarization of both light signals are reciprocally rotated by a predetermined angle of rotation by rotation means between the two polarizers. From light intensities of the two light signals, after passing through the series circuit, a measuring signal is determined which is independent of vibrations and bending influences in the optical fibers.